合成路线1

3) The condensation of 2-bromobenzoic acid (XII) with 4-nitroaniline (XIII) by means of SOCl2 in DMF gives the corresponding amide (XIV), which is cyclized with sodium azide and SOCl2 in acetonitrile - DMF, yielding 5-(2-bromophenyl)-1-(4-nitrophenyl)tetrazole (XV). The condensation of (XV) with the boronic acid (VI, Scheme 1) by means of Na2CO3 and tetrakis(triphenylphosphine)palladium in methanol - water - toluene affords 5-(4'-methylbiphenyl-2-yl)-1-(4-nitrophenyl)tetrazole (XVI), which is brominated with NBS and AIBN to the corresponding bromomethyl derivative (XVII). The condensation of (XVII) with quinolone (III, Scheme 1) by means of K2CO3 in hot N-methylpyrrolidone gives 2-ethyl-4-[2'-[1-(4-nitrophenyl)tetrazol-5-yl]biphenyl-4-ylmethoxy] quinoline (XVIII), which is finally deprotected with NaH and propanethiol in N-methylpyrrolidone. 4) The dehydration of the boronic acid (VI), followed by bromination with bromine and AIBN, gives 4-(bromomethyl)boronic anhydride (XIX), which is condensed with quinolone (III) by means of K2CO3 in N-methylpyrrolidone, yielding 4-(2-ethylquinolin-4-yloxymethyl)phenylboronic acid (XX). The condensation of (XX) with the bromophenyl-tetrazole (XV) by means of K2CO3 and tetrakis(triphenylphosphine)palladium in water - methanol - toluene yields compound (XVIII), already obtained (5). Scheme 2. 5) The reaction of the boronic acid (VI) with 2,2-dimethylpropane-1,3-diol (XXI) in refluxing cyclohexane gives the cyclic boronic ester (XXII), which is brominated with BBS as before to the bromomethyl derivative (XXIII). The condensation of (XXIII) with quinolone (III) affords 2-[4-(2-ethylquinolin-4-yloxymethyl)phenyl]-5,5-dimethyl-1,3,2-dioxaborinane (XXIV), which is condensed with (XV) as before to give (XVIII), already obtained.